[T]he biplane grew smaller and smaller, the stacatto clatter of the motor became once more a drone which imperceptibly became melded with the waning murmur of country sounds .... ["Aircraft" magazine, October 1910]

But it is perhaps an image from card-playing, where the verb meld is attested by 1907 in a sense of "combine two cards for a score:"

Upon winning a trick, and before drawing from the stock, the player can "meld" certain combinations of cards. [rules for two-hand pinochle in "Hoyle's Games," 1907]

The rise of the general sense of the word in English coincides with the craze for canasta, in which melding figures. The card-playing sense is said to be "apparently" from German melden "make known, announce," from Old High German meldon, from Proto-Germanic *meldojan (cf. Old English meldian "to declare, tell, display, proclaim"), and the notion is of "declaring" the combination of cards. Related: Melded; melding.